JP2004110184A - Optical coordinate input system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To permit optical coordinate inputting with stable position detection accuracy independent of the holding attitude of an operator. <P>SOLUTION: If the operator holds a coordinate indication member (hereinafter referred to as an input pen) 3 and indicates desired coordinates on an information display unit 1 of display surface, a scanning beam 8 illuminates a front edge part 10 of the input pen 3 at certain timing. In the input pen 3, the internal diffused light of the illuminated light beam is detected with a photosensing element 11, indicating the detection to a control part 13, and then the control part 13 drives a light emitting element 15 via a drive circuit 14 to transmit an optical signal. Then, when the optical signal is detected with an optical signal detection means 6, from a time difference (count number) between reference time and reception time when the optical signal is detected with the light signal detection means 6, the rotation angle of a rotary optical system is calculated with a central control processing means 7. By using the calculation result, the central control processing means 7 calculates the coordinate position of the indicated point. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for acquiring input information on a paper surface, or for inputting stroke data and moving instructions of a cursor on a screen of a personal computer, an amusement input device, a portable terminal, or the like, and inputting stroke data. To an optical coordinate input system for inputting a coordinate.
[0002]
[Prior art]
Conventionally, as a coordinate input system for detecting a light beam to be scanned, transmitting a predetermined signal, and detecting a designated coordinate position based on the information on the scanning state and the transmission signal information, Japanese Patent Application Laid-Open No. 2000-284895 (Patent) There is one disclosed in Reference 1). In this system, as shown in FIG. 14, an optical means for converting scanning light into diffused light is provided at the tip of the pointing member, and an element for receiving scattered light is provided therein to receive scanning light. .
[0003]
[Patent Document 1]
JP 2000-284895 A
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned Japanese Patent Application Laid-Open No. 2000-284895, the scanning beam scans a space separated by a predetermined distance from a display member, for example, a display surface such as a display, from the viewpoint of preventing malfunction of the apparatus. Is merely detecting the position away from the tip of the coordinate pointing member (the part that is actually pointing). For example, if the operator holds the input pen of the coordinate pointing member while tilting, the tilted posture actually An error occurs between the pen point and the detection position, which are the indicated coordinates of. For this reason, when a mouse operation of a PC or the like is performed by this apparatus, a problem occurs such that operability is significantly impaired due to a mismatch between a pointer on a screen display and a detection position.
Regarding this problem, conventionally, a mark is displayed at a plurality of known positions on a display surface by a calibration function, the mark is designated by the coordinate designating member, a parameter value for correction is obtained, and the correction is performed. The problem is solved by estimating the exact position of the designated point using the value.
[0005]
However, since the posture of the coordinate indicating member frequently changes with the movement of the operator, it is necessary to frequently perform calibration in practical use. Therefore, the above-described conventional position correction method using calibration has a problem that operation complexity remains.
[0006]
The present invention has been made in view of such a situation, and has the following objects.
A first object is to provide an optical coordinate input system having stable position detection accuracy that is not affected by the holding posture of an operator.
[0007]
A second object is to provide an optical coordinate input system capable of transmitting an instruction intended by an operator and improving operability of an information processing apparatus equipped with the present system.
[0008]
A third object is to provide an optical coordinate input system capable of confirming stable reception of a scanning beam and having a stable detection function.
[0009]
A fourth object is to provide an optical coordinate input system capable of identifying a plurality of coordinate indicating members.
[0010]
A fifth object is to provide an optical coordinate input system capable of preventing malfunction due to unnecessary scanning beams and preventing unnecessary power consumption.
[0011]
A sixth object is to provide an optical coordinate input system that can prevent a malfunction, a false detection, and the like.
[0012]
A seventh object is to provide an optical coordinate input system capable of acquiring corresponding writing coordinate information at the same time as writing, and easily applicable to an electronic board or the like.
[0013]
[Means for Solving the Problems]
In order to achieve such an object, the present invention has the following features.
According to the first aspect of the present invention, there is provided an apparatus main body having a scanning unit for emitting a light beam scanned from at least two places in parallel with the surface of the display member, and detecting the light beam irradiated on a predetermined part. A coordinate input system comprising: a coordinate indicating member having means for transmitting a predetermined signal; and a coordinate input system for detecting an indicated coordinate position by the coordinate indicating member using information on a scanning state and signal information from the coordinate indicating member. Wherein the coordinate indicating member includes a light receiving unit for scanning a light beam, and a light emitting unit disposed at a position separated by a predetermined distance from the light receiving unit, and a light emitting unit is provided at a predetermined position on the display member. At least one optical signal detecting means for detecting an optical signal from the means and an incident angle of the optical signal is provided, and a coordinate indicating point of a coordinate indicating member is used by using information on a scanning state and information from the optical signal detecting means. Calculate the coordinate position of Characterized by comprising a calculating means.
[0014]
According to a second aspect of the present invention, the scanning means has two rotating optical systems controlled by the control means so as not to simultaneously scan the measurement range on the display member, and the calculating means has two rotating optical systems. The light beam from each of the above is obtained from the reception time information of the optical signal detection means the information of the time when the coordinate pointing member was irradiated, the irradiation position is calculated from the irradiation angle information in the reception time, the light signal detection means, A light receiving element capable of detecting at least one incident beam position; calculating means for calculating azimuth information of the light emitting means on the front coordinate indicating member from the incident beam position information detected by the optical signal detecting means; Estimating the position of the designated portion of the coordinate pointing member using the irradiation position information of the coordinate pointing member, the azimuth information of the light emitting means, and the mounting coordinate information of the optical signal detecting means calculated from the information of the coordinate pointing member. To.
[0015]
According to a third aspect of the present invention, the coordinate pointing member includes an information selecting unit that is operated by a predetermined operation unit, a unit that detects that the information selecting unit is selected, and superimposes a predetermined signal on the optical signal. Means for receiving the information signal superimposed on the signal detecting means and converting it into a predetermined signal.
[0016]
According to a fourth aspect of the present invention, the coordinate indicating member includes a means for displaying a light receiving state of the light beam at a predetermined position.
[0017]
According to a fifth aspect of the present invention, the coordinate pointing member includes an identification information storage unit storing at least one identification information, a unit for superimposing a modulation signal on the optical signal based on the identification information, and an optical signal detection unit. Means for reproducing an identification signal from the received modulated signal.
[0018]
The invention according to claim 6 is characterized in that the calculating means monitors the input of the optical signal by the optical signal detecting means and stops the emission of the scanning light when there is no input for a predetermined time.
[0019]
The invention according to claim 7 is characterized in that the above-mentioned optical signal detecting means uses information of only a predetermined light receiving level or higher.
[0020]
The invention according to claim 8 is characterized in that the coordinate indicating member is provided with a writing member such that the writing member can be written at a position indicating the coordinate.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an optical coordinate input system according to the present invention will be described in detail with reference to FIGS.
First, FIG. 1 shows an outline of an apparatus according to a first embodiment of the present invention, and FIGS. 2, 3, 4 and 5 show an operation principle and components thereof.
[0022]
As shown in FIG. 1, an optical coordinate input system according to a first embodiment of the present invention includes an information display unit 1 such as an LCD or a CRT display and an information display unit 1 supported by an operator. The apparatus includes a coordinate indicating member 3 for indicating coordinates, and an apparatus main body 2 having a scanning and detecting unit disposed at a position facing the coordinate indicating member 3.
[0023]
The device main body (optical coordinate input device main body) 2 includes a light beam scanning unit (scanning unit) that emits a light beam that is scanned in parallel with the surface of the information display unit 1 from two positions of the rotary optical systems 4a and 5a. ) 4, 5; an optical signal detecting means 6 for detecting a light emission signal from the coordinate indicating member 3 described above; and a central control processing means (calculating means) 7 for controlling various operations and each unit. The central control processing means 7 includes a storage means for storing a calculation result and the like.
[0024]
The light beam scanning units 4 and 5 include LD or LED light source units 4b and 5b having a collimating optical system, and rotating optical systems 4a and 5a each having a mirror attached to a rotating element such as a motor. It is provided with light receiving elements 4c and 5c for receiving the incident light beam, and controllers 4d and 5d for controlling rotation and light emission of the light source. The positions of both the light beam scanning units 4 and 5 are known. I have.
The rotating optical systems 4a and 5a are rotated at a constant angular velocity, and have light receiving elements 4c and 5c installed at predetermined positions for timing detection. The light receiving elements 4c of scanning light beams (scanning beams) are provided. The time information of the system is counted by the controllers 4d and 5d on the basis of the incidence on the light beams 5c and 5c.
[0025]
Further, as shown in FIG. 2, the tip portion 10 of the input pen, which is the coordinate pointing member 3 described above, is formed of a transparent member having irregularities on its surface, and the scanning beam (scanning beam 8) transmits the transparent beam. A light-receiving element (light-receiving means) 11 for detecting scattered light generated inside when the light is irradiated on the front end portion 10 is provided at a predetermined position inside. Then, based on the detection signal of the light receiving element 11, a light emitting element (light emitting means) 15 such as an LED mounted on the other end of the input pen (coordinate indicating member 3) is turned on, and a diffusion optical system installed in an exit window 16 is provided. The optical signal is transmitted through the optical disc.
[0026]
Further, in the present embodiment, as shown in FIG. 3, the optical signal detecting means 6 includes a lens 20, a light receiving element 21 disposed on a focal plane of the lens 20 and capable of detecting an incident spot position. It is provided with an incident azimuth detecting section composed of a semiconductor element such as a PSD or a CCD, and a conversion circuit section 22 for converting an output to position information, and detects an optical signal from the light emitting section 15 and the incident direction thereof. .
[0027]
Next, a position detection operation according to the present embodiment will be described with reference to FIGS.
In the present embodiment, the rotation of the rotation optical systems 4a and 5a is performed by using the light beam scanning units 4 and 5 to rotate the light beams by the light beam scanning units 4 and 5 in a parallel plane of a known height on the surface of the information display surface (information display unit) 1. Scanning irradiation is performed in a radial manner. However, at this time, the central control processing means 7 and the controllers 4d and 5d control and drive the light emission timings of the light emitting elements 4b and 5b and the rotation drive systems 4a and 5a so as not to simultaneously scan the measurement range.
[0028]
When an operator holds a coordinate indicating member (hereinafter, input pen) 3 and specifies desired coordinates on the information display unit 1 which is a display surface, the above-mentioned scanning beam 8 becomes transparent at a certain timing. The part (tip part) 10 is irradiated. In the input pen 3, the internal scattered light of the irradiated light beam is detected by the light receiving element 11 (converted into a predetermined signal by the receiving circuit 12 included), and notified to the control unit 13; The light emitting element 15 is driven via the drive circuit 14 to transmit an optical signal.
Then, when the optical signal is detected by the optical signal detecting means 6, the reference time (in this embodiment, the light receiving timing at the light receiving elements 4c and 5c is the reference time) and the reception by the optical signal detecting means 6 The central control processing means calculates the rotation angle of the rotating optical system from the time difference (count count) with the information.
At this time, a slight time difference occurs between the actual irradiation time and the reception time of the optical signal. This is mainly due to the time delay from the light reception by the input pen 3 to the driving of the light emitting element. It is. For this reason, this time is stored as a correction parameter by the central control means, and each rotation angle at the time of irradiation is obtained by correction. The irradiation position is calculated based on the principle of triangulation.
[0029]
Here, as shown in FIG. 4, the irradiation beam angles α and β calculated by the above-described detection method and the rotation angles of the rotation optical systems 4 a and 5 a in the corresponding rotation scanning means (light beam scanning units) 4 and 5. The optical center position (known at the time of design, P1, P2 here) on the display coordinates (coordinates on the display surface 1) corresponding to, the irradiation position on the coordinate indicating member 3 is S1, and a perpendicular from the S1 to the line segment P1P2 is drawn. Assuming that the intersection at the time of subtraction is M, the following equation is established from the geometric relationship.
[0030]
| S1 M | = L1 · tanα = (L−L1) tanβ
Where | S1M | represents the size of the line segment S1M, L is the distance between P1 and P2 (L = | P1P2 |), and L1 is the distance between P1 and M (L1 = | P1M |). Shall be represented.
[0031]
Therefore, by solving for L1 from the above relationship, the following equation holds.
L1 = L · tanβ / (tanα + tanβ)
| S1 M | = Ltan tan β / (tan α + tan β)
[0032]
From the above results and the optical center position coordinates P1 and P2 corresponding to the rotation angles of the rotary scanning units (light beam scanning units) 4 and 5, the central control processing unit 7 determines the irradiation coordinate position S1 on the coordinate indicating member 3. Is calculated. Here, two orthogonal sides of the display screen 1 are defined as X and Y axes (hereinafter referred to as a display coordinate system), and an irradiation angle is defined as an angle formed with the X axis.
[0033]
Next, a method of calculating the designated point will be described.
As shown in FIG. 3, the optical signal detector 6 includes a lens 20 and a position detecting element 21 (a light receiving element such as a PSD or a CCD that outputs incident spot position information at a focal distance position of the lens 20; In this embodiment, the position information on the light receiving surface of the light-converging spot of the light emission signal of the light transmitting unit, for example, in the case of the PSD of this embodiment, each side of the light receiving surface A linear operation value of the photocurrent value from each electrode provided above (in the case of a configuration in which the center of gravity of the light receiving surface coincides with the lens optical axis, the operation result directly represents the spot position information) together with the optical signal reception signal Detection, focal length of the optical system and local coordinate system assumed on the light receiving surface (for example, the optical axis of the optical system is the y 'axis, the x' and z 'axes are parallel to each side of the rectangular light receiving surface, and the optical center is (Assuming the origin) The position (x'p, z'p) and the incident azimuth (direction vector) V = (Vx, Vy, Vz) components are obtained from the relationship of the intersection of the straight line tV (t is an arbitrary number) and the plane y '= f. The following relationship holds.
x'p / Vx = f / Vy = z'p / Vz
[0034]
Note that the correspondence between the local coordinate system and the display coordinate system is converted into a direction vector V in the display coordinate system. This conversion is based on the fact that the vector components match in a relationship where the coordinate systems are parallel as shown in FIG.
Here, as shown in FIG. 5, the position S1 is a position coordinate of the scanning beam on the scanning plane 25. Accordingly, the spherical surface 26 having a value obtained by subtracting the height from the display coordinates of the scanning beam from the height of the light emitting portion of the coordinate indicating member 3 around the position coordinate S1 is parallel to the direction vector V of the light emission signal from the input pen. Then, the light emitting unit position S3 is obtained from the intersection with a straight line L1 + kV (k is an arbitrary number) passing through the optical center position L1 (coordinate value in the display coordinate system, known at the time of design) of the optical signal detecting means 6.
[0035]
However, in practice, the distance | S1 S3 | fluctuates due to a change in posture. Therefore, when the input pen is mounted so that the distance of the light emitting portion of the input pen is larger than the distance between the scanning plane and the display surface, the distance | S2 between the scanning beam irradiation position and the light emitting portion when the input pen is set upright Even if S3 | [known] is equal to the distance | S1 S3 |, the error is small, and there is substantially no problem. | S2S3 | is used as the radius in this embodiment. In general, there are two intersections between the straight line and the spherical surface 26 having the radius | S2S3 |. However, as in the present embodiment, the operator holds the pen (usually, the pen is tilted to his side). Based on the positional relationship between the detecting unit 6 and the light emitting unit (on the input pen 3), an intersection farther from the detecting unit may be set as the light emitting unit position S3, which can be obtained substantially uniquely.
[0036]
From the above principle, the spatial position of the two intersections of the position coordinates S3 of the light emitting unit and the scanning beam irradiation position S1 (= S2) can be detected, and the intersection between the straight line S1S3 connecting these two points and the display coordinate plane 1 is obtained. The pointing point S is calculated. By calculating the pointing point S, the pointing point S of the coordinate pointing member 3 can be accurately detected without being affected by the attitude of the input pen.
[0037]
Next, an optical coordinate input system according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the one shown in FIG. 6 is used instead of the coordinate pointing member 3 shown in FIG. 2 in the first embodiment.
[0038]
In the coordinate indicating member 3 according to the present embodiment, as shown in FIG. 6, a display unit 30 such as a light-emitting unit (light-emitting element 15) that emits a visible light LED having a different wavelength from the light-emitting unit and a bar display using a small liquid crystal display element is used. Thereby, the light receiving level of the detection light (detected light beam) at the light receiving element 11 is visualized and displayed. The display control unit 31 controls display on the display unit 30.
[0039]
According to the present embodiment, for example, by turning on the display LED when a specified light receiving intensity is reached, or expressing the light receiving intensity by displaying the length of the bar on the LCD, the scanning beam can be normally set in the coordinate pointing member. It is possible to confirm that the light is irradiated on the light emitting device 3, and it is possible to prevent malfunction and early detection of a failure or the like.
[0040]
Next, an optical coordinate input system according to a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the one shown in FIG. 7 or FIG. 11 is used instead of the coordinate indicating member 3 shown in FIG. 2 in the first embodiment described above, and the optical signal detecting means 6 and the central control processing means 7 are used. Are as shown in FIG.
[0041]
As shown in FIG. 7, the coordinate indicating member 3 according to the present embodiment includes a storage unit (identification information storage unit) 36 and a predetermined one of identification information stored in advance in the storage unit 36 as a return switch. And a selection switch 35 for the operator to select.
[0042]
As a transmission method from the coordinate indicating member 3, for example, transmission is performed by the ASK method, and as shown in FIG. 8, the light output of the light emitting element (for example, an infrared LED in this embodiment) is controlled by this selection information. The controller 13 superimposes the modulation signal on the carrier signal and directly modulates the diffused light from the light emitting element. As a frame configuration of a signal to be transmitted, as shown in FIG. 9, for example, following a preamble 45 for synchronization on the receiving side, identification information 46 based on the selected identification signal is transmitted.
[0043]
Further, in the present embodiment, in consideration of controlling the image information on the display screen by emulating a mouse using the present instruction member, for example, it instructs a click operation and the like essential for GUI operation on the screen. There is a need.
Therefore, as shown in FIG. 11, means 55 (for example, a button) corresponding to a click button on a mouse is provided on the pointing member, and the detection circuit 56 detects that the button is pressed, and responds. An information signal is added as data 47 after the identification information. Finally, a return code 48 is added to perform communication.
[0044]
On the receiving side (apparatus main body 2), as shown in FIG. 10, for example, a signal from the light receiving element 21 is used, a baseband signal is extracted by a detection unit 50, and synchronization is obtained by a synchronization unit 51. The demodulator 52 demodulates the signal into a digital signal. Then, the central control means 7 identifies an operation instruction signal corresponding to the identification signal of the instruction member, and transmits a predetermined signal to the next information equipment.
Further, the optical signal is detected by sampling based on the synchronization signal, and the direction vector V of the light emitting element unit is calculated based on the position information of the optical signal detecting means 6.
[0045]
As described above, according to the present embodiment, by transmitting and receiving the identification signal, it is possible to detect the optical signal without malfunction due to the uniquely determined identification signal even in an environment where other infrared devices are present. It is possible to prevent malfunction. Therefore, even if a plurality of coordinate indicating members are used, the coordinate indicating members can be identified.
[0046]
Next, a control example in the case where power control is performed in the above-described first to third embodiments will be described with reference to the flowchart in FIG.
[0047]
In the apparatus main body 2 having the configuration shown in FIGS. 1 and 10, as shown in FIG. 12, the central control processing device 7 monitors the input of the optical signal by the optical signal detecting means 6, and when there is no optical input for a predetermined time ( If it is in operation (step S12; NO), the driving of the light emitting elements 4b, 5b and the rotary optical systems 4a, 5a of the light beam scanning units 4, 5 is stopped (step S13). (Step S12; Yes) The state is maintained (step S14).
[0048]
Then, the central control processing means 7 periodically checks the input of the optical signal from the optical signal detecting means 6, and when the operator inputs coordinates again after the above-described stop, the operator operates the coordinate indicating member 3 An optical signal is transmitted, for example, by pressing a button (button 55 in FIG. 11 used for a click operation) provided in the device, and it is confirmed that the optical signal detecting means 6 detects an input of an optical signal of a specified value or more. Then, the light emitting elements 4b and 5b and the rotary optical systems 4a and 5a are driven again (step S16), and the system returns to the position detection and optical signal detection states (step S17). Thus, unnecessary power consumption can be suppressed.
Furthermore, the rotation optical systems 4a and 5a are not completely stopped, but are rotated at a low speed in the energy saving mode, so that the return time can be shortened.
[0049]
Further, by monitoring information of the input of the optical signal by the optical signal detecting means 6 described above, it is possible to prevent erroneous operation, erroneous detection and the like by using information of only a predetermined light receiving level or more (step S11).
[0050]
Next, an optical coordinate input system according to a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the one shown in FIG. 13 is used in place of the coordinate pointing member 3 shown in FIG. 2 in the first embodiment.
[0051]
In the present embodiment, as shown in FIG. 13, a writing member 63 such as an ink cartridge is mounted at the tip (position for indicating coordinates) of the coordinate indicating member 3. Thus, the coordinate indicating member 3 of the present embodiment can be written with the above-described writing member 63 at the position indicating the coordinate on the information display unit 1. For this reason, when the display screen (information display unit 1) is made of a writable member, for example, when the coordinate input device of the present invention is installed on an electronic board, it is possible to acquire the corresponding writing coordinate information simultaneously with writing. For example, contents written on an electronic board used in a meeting or the like can be used as digital information, for example, stored as a document on a PC or the like provided at a later stage.
[0052]
In the present embodiment, in order to enable the system, a cylindrical cavity is provided at the tip of the coordinate pointing member 3 and the writing member is inserted therein. In addition, a plurality of tip end light receiving elements (two in this embodiment, 62a and 62b) are mounted symmetrically around the position of the above-described writing member 63 so that it can cope with a wide range of incident angles of the scanning beam. I have to.
[0053]
Each of the above-described embodiments is a preferred embodiment of the present invention, and can be variously modified and implemented without departing from the gist of the present invention.
For example, by providing the optical signal detecting means with an optical filter for preventing the incidence of light other than the light source wavelength of the coordinate indicating member 3, optical noise such as disturbance light is reduced and the S / N ratio is improved. It is possible to do.
[0054]
Further, as the discrimination of the plurality of coordinate indicating members 3, it is also possible to discriminate by switching the frequency of the carrier wave by the plurality of oscillators and detecting the received signal by the corresponding band-pass filter on the receiving side (apparatus main body 2).
Further, the present invention may be applied to a measuring device or the like for measuring two-dimensional information. In this case, the measurement device performs measurement using the above-described optical coordinate input according to the present invention.
[0055]
【The invention's effect】
As described above, according to the present invention, the coordinate position of the coordinate pointing point by the coordinate pointing member can be detected (calculated) with high accuracy without being affected by the attitude of the coordinate pointing member. For this reason, optical coordinate input can be performed with stable position detection accuracy independent of the holding posture of the operator.
[0056]
Further, the coordinate indicating member can transmit an instruction intended by the operator, and the operability of the information processing apparatus equipped with the present system can be improved.
Further, since the light receiving state of the light beam can be displayed, stable light reception of the light beam can be confirmed, and a stable detection function can be provided.
[0057]
Further, since the identification information is stored in the coordinate pointing member, the apparatus main body can uniquely detect a signal from the coordinate pointing member. Therefore, even if a plurality of coordinate indicating members are used, the coordinate indicating members can be identified.
[0058]
In addition, since emission of the scanning light can be stopped when there is no input for a certain period of time, malfunction due to unnecessary scanning beams and unnecessary power consumption can be prevented.
[0059]
In addition, by using only information that is equal to or higher than the predetermined light receiving level, it is possible to prevent a malfunction or a false detection.
[0060]
Further, by disposing the writing member, it is possible to acquire the corresponding writing coordinate information at the same time as the writing, thereby facilitating application to an electronic board or the like.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of an optical coordinate input system as a first embodiment of the present invention.
FIG. 2 is a diagram for explaining a configuration and an operation principle of a coordinate pointing member 3 according to the first embodiment.
FIG. 3 is a diagram illustrating a configuration example of an optical signal detection unit 6 according to the first embodiment.
FIG. 4 is a diagram exemplifying a geometric relationship among an irradiation position S1 on a coordinate indicating member 3, optical center positions P1 and P2 of rotating optical systems 4a and 5a, and irradiation beam angles α and β.
FIG. 5 is a diagram for explaining a method of calculating a designated point on the coordinate pointing member 3 in the embodiment.
FIG. 6 is a diagram illustrating a configuration example and an operation example of a coordinate pointing member 3 according to a second embodiment of the present invention.
FIG. 7 is a diagram illustrating a configuration example and an operation example of a coordinate pointing member 3 according to a third embodiment of the present invention.
FIG. 8 is a waveform diagram exemplifying a transmission signal obtained by superimposing a modulation signal on a carrier signal by a control unit 13 and directly modulating diffused light from a light emitting element in the third embodiment.
FIG. 9 is a diagram illustrating a frame configuration of a signal to be transmitted in the third embodiment.
FIG. 10 is a block diagram illustrating a configuration around an optical signal detection unit 6 and a central control processing unit 7 according to a third embodiment;
FIG. 11 is a diagram showing another configuration example of the coordinate pointing member 3 according to the third embodiment of the present invention.
FIG. 12 is a flowchart illustrating a control example when power control is performed in the first to third embodiments.
FIG. 13 is a diagram illustrating a configuration example of a coordinate pointing member 3 according to a fourth embodiment of the present invention.
FIG. 14 is a diagram showing a configuration of a conventional coordinate input system.
[Explanation of symbols]
1 information display part (display member)
2 Main unit
3 Coordinate indicating member
4, 5 light beam scanning unit (scanning means)
4a, 5a rotating optical system
4b, 5b Light emitting element (light source unit)
4c, 5c light receiving element
4d, 5d controller
6 Optical signal detection means
7. Central control processing means (calculation means)
8 Scanning beam (light beam by scanning)
10 Tip
11 Light receiving element (light receiving means)
12 Receiver circuit
13 Control unit
14 Drive circuit
15 Light emitting element (light emitting means)
16 Emission window
20 lenses
21 Light receiving element
22 Conversion circuit
30 Display
31 Display control unit
35 Selection switch (information selection means)
36 storage means (identification information storage means)
45 preambles
46 Sender ID
47 data
48 CR
55 buttons
56 detection circuit
62 Tip light receiving element
63 writing material

Claims (8)

An apparatus main body including a scanning unit that emits a light beam scanned from at least two places in parallel with the surface of the display member; and a unit that detects a light beam applied to a predetermined portion and transmits a predetermined signal. A coordinate input system comprising a coordinate indicating member provided, and detecting a designated coordinate position by the coordinate indicating member using information of the scanning state and signal information from the coordinate indicating member,
The coordinate indicating member includes a light receiving unit for receiving the light beam by the scanning, and a light emitting unit disposed at a position separated by a predetermined distance from the light receiving unit,
At a predetermined position of the display member, at least one optical signal from the light emitting unit and an optical signal detecting unit that detects an incident angle of the optical signal are provided,
An optical coordinate input system comprising: a calculating unit that calculates a coordinate position of a coordinate pointing point of the coordinate pointing member using information on the scanning state and information from the optical signal detecting unit. The scanning unit has two rotating optical systems controlled by a control unit so as not to simultaneously scan within a measurement range on the display member,
The calculating means obtains information on the time at which the light beams from each of the two rotating optical systems are irradiated on the coordinate pointing member from the receiving time information of the optical signal detecting means, and obtains the irradiation angle information at the receiving time. Calculate the irradiation position from
The optical signal detection means has a light receiving element capable of detecting at least one incident beam position,
The calculating means calculates azimuth information of the light emitting means on the front coordinate indicating member from the incident beam position information detected by the optical signal detecting means, and irradiating position information of the coordinate indicating member calculated from the information of the light beam. The optical coordinate input system according to claim 1, wherein the position of the pointing portion of the coordinate pointing member is estimated using the azimuth information of the light emitting unit and the mounting coordinate information of the light signal detecting unit. . The coordinate indicating member includes an information selecting unit that is operated by a predetermined operation unit, a unit that detects that the information selecting unit is selected, and superimposes a predetermined signal on the optical signal, and the superimposition on the optical signal detecting unit. 3. An optical coordinate input system according to claim 1, further comprising means for receiving the converted information signal and converting it into a predetermined signal. 3. The optical coordinate input system according to claim 1, wherein said coordinate indicating member includes means for displaying a light receiving state of said light beam at a predetermined position. The coordinate indicating member includes identification information storage means storing at least one identification information, means for superimposing a modulation signal on the optical signal based on the identification information, and the modulation signal received by the optical signal detection means. 3. The optical coordinate input system according to claim 1, further comprising: means for reproducing the identification signal from a computer. The said calculation means monitors the input of an optical signal by the said optical signal detection means, and stops light emission of scanning light when there is no input for a fixed time, The Claim 1 characterized by the above-mentioned. Optical coordinate input system. The optical coordinate input system according to any one of claims 1 to 6, wherein the optical signal detection means uses information of only a predetermined light receiving level or higher. The optical coordinate input system according to any one of claims 1 to 7, wherein the coordinate indicating member is provided with a writing member so as to be writable at a position where the coordinate is indicated.

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